Perceptual illusions and brain models.

[This paper develops the notion of perceptual hypotheses and also raises questions concerning the distinction to be made between ‘analogue’ and ‘digital’. This is made in the context of the brain, and seems important if we are to be clear in how we use an engineering distinction. The point is: Should the distinction be regarded as one of engineering convenience (continuous or discontinuous mechanisms, or circuits) or should it be regarded as a deeper logical distinction? I incline to the latter view.]